From 1e49845629e93d4513b9388c524d7d1e0ac945f8 Mon Sep 17 00:00:00 2001
From: pommicket <pommicket@gmail.com>
Date: Thu, 3 Nov 2022 17:47:09 -0400
Subject: custom shaders now use #version 130 if possible

like i promised they would
---
 config.c | 10 +++++-----
 gl.c     | 24 +++++++++++++++++++-----
 text.c   |  6 ++----
 3 files changed, 26 insertions(+), 14 deletions(-)

diff --git a/config.c b/config.c
index 612a647..ab68241 100644
--- a/config.c
+++ b/config.c
@@ -877,21 +877,21 @@ void config_parse(Ted *ted, ConfigPart **pparts) {
 	arr_foreach_ptr(ted->all_settings, Settings, s) {
 		if (*s->bg_shader_text) {
 			// load bg shader
-			char vshader[] = "#version 110\n\
-	attribute vec2 v_pos;\n\
+			char vshader[8192] ;
+			strbuf_printf(vshader, "attribute vec2 v_pos;\n\
 	varying vec2 t_pos;\n\
 	void main() { \n\
 		gl_Position = vec4(v_pos * 2.0 - 1.0, 0.0, 1.0);\n\
 		t_pos = v_pos;\n\
-	}";
+	}");
 			char fshader[8192];
-			strbuf_printf(fshader, "#version 110\n\
-	varying vec2 t_pos;\n\
+			strbuf_printf(fshader, "varying vec2 t_pos;\n\
 	uniform float t_time;\n\
 	uniform float t_save_time;\n\
 	uniform vec2 t_aspect;\n\
 	#line 1\n\
 	%s", settings->bg_shader_text);
+			
 			s->bg_shader = gl_compile_and_link_shaders(ted->error, vshader, fshader);
 			if (s->bg_shader) {
 				GLuint bg_buffer = 0, bg_array = 0;
diff --git a/gl.c b/gl.c
index 1d6cb14..ddb4ba4 100644
--- a/gl.c
+++ b/gl.c
@@ -77,10 +77,26 @@ static void gl_get_procs(void) {
 	#undef gl_get_proc
 }
 
+static GLuint glsl_version(void) {
+	int v = gl_version_major * 100 + gl_version_minor * 10;
+	switch (v) {
+	case 200: return 110;
+	case 210: return 120;
+	}
+	// don't go above 130. i don't want to write two different shaders one using varying and one using whatever new stuff GLSL has these days
+	return 130;
+}
+
 // compile a GLSL shader
 static GLuint gl_compile_shader(char error_buf[256], char const *code, GLenum shader_type) {
 	GLuint shader = glCreateShader(shader_type);
-	glShaderSource(shader, 1, &code, NULL);
+	char header[32];
+	strbuf_printf(header, "#version %u\n#line 1\n", glsl_version());
+	const char *sources[2] = {
+		header,
+		code
+	};
+	glShaderSource(shader, 2, sources, NULL);
 	glCompileShader(shader);
 	GLint status = 0;
 	glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
@@ -171,8 +187,7 @@ static GLuint gl_geometry_v_color;
 static GLuint gl_geometry_vbo, gl_geometry_vao;
 
 static void gl_geometry_init(void) {
-	char const *vshader_code = "#version 110\n\
-	attribute vec2 v_pos;\n\
+	char const *vshader_code = "attribute vec2 v_pos;\n\
 	attribute vec4 v_color;\n\
 	varying vec4 color;\n\
 	void main() {\n\
@@ -180,8 +195,7 @@ static void gl_geometry_init(void) {
 		color = v_color;\n\
 	}\n\
 	";
-	char const *fshader_code = "#version 110\n\
-	varying vec4 color;\n\
+	char const *fshader_code = "varying vec4 color;\n\
 	void main() {\n\
 		gl_FragColor = color;\n\
 	}\n\
diff --git a/text.c b/text.c
index 144a7a0..a3ff48e 100644
--- a/text.c
+++ b/text.c
@@ -90,8 +90,7 @@ static GLuint text_v_pos, text_v_color, text_v_tex_coord;
 static GLint  text_u_sampler;
 
 static bool text_init(void) {
-	char const *vshader_code = "#version 110\n\
-attribute vec4 v_color;\n\
+	char const *vshader_code = "attribute vec4 v_color;\n\
 attribute vec2 v_pos;\n\
 attribute vec2 v_tex_coord;\n\
 varying vec4 color;\n\
@@ -102,8 +101,7 @@ void main() {\n\
 	gl_Position = vec4(v_pos, 0.0, 1.0);\n\
 }\n\
 ";
-	char const *fshader_code = "#version 110\n\
-varying vec4 color;\n\
+	char const *fshader_code = "varying vec4 color;\n\
 varying vec2 tex_coord;\n\
 uniform sampler2D sampler;\n\
 void main() {\n\
-- 
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